This mouse, specially designed for quiet rotation, encourages your pet with hours of healthy exercise. Size: Wheel diameter: 12.92 inches (4.92 inches), width: 5.28 cm (2.28 inches), height: 14.6 cm (5.75 inches), support length : 14.5 cm (5.70 inch), material: plastic. This running wheel is designed for hamster, gerbils, hedgehogs, mice and other similar small animals. It brings your hamster endless little happiness, also brings you a quiet night, even if your hamster on the racing track at the racing and hamster wheel is spinning. As the hamster likes the hamster wheel to roll like a runner to help them break boredom and enrich their night, also keep them exercising to maintain their strength and well-being.< /p>